Compound steam-engine



(No Model.)

0.. SOHL'ARED. COMPOUND STEAM ENGINE.

No. 543,057. Patented July 23, 1895.

[NYE/V202 orneya CHARLES SOHLARED,

PATENT OFFICE.

OF COLUMBUS, OHIO.

COMPOUND STEAM-ENGINE.-

. SPECIFICATION forming part of Letters Patent No. 543,057, dated July28, 1895.

Application filed fieptember 25, 1893. Serial No. 486,408- (No model.)

To all whom it may concern:

Be it known that I, CHARLES SCHLARED, a citizen of the United states,residing at O0- lumbus, in the county of Franklin and State of Ohio,have invented certain new and useful Improvements in CompoundSteam-Engines; and I do hereby declare the following to be a full,clear, and exact description of the inven-' tion, such as will enableothers skilled in the art to which-it appertains to make and use thesame.

My invention relates particularly to the kind of compound engine ofwhich the patent granted to W. Baxter, J r., July 21, 1874, No. 153,300,is an example-that is, those in which the piston in both the high andlow pressure cylinders move simultaneously in the same direction. Myinvention consists of a construction and arrangement of ports, passages,and valve that simplify and cheapen the manufacture of such engines andlessen the expense of running them by preventing as far as possible lossof heat from the steam in its passage from one cylinder to the other, ashereinafter set forth.

In the accompanying drawings, Figure l is avertical sectional view ofthe cylinders and valve, taken on a plane designated by the line a: x ofFig. 2; and Fig. 2 is a transverse vertical sectional view.

1 and 2 designate the small and large or high and low pressurecylinders, respectively, which are independent of each other and arearranged one above the other. Each of the cylinders is furnished withthe usual piston, the rods of which may be connected to one cross-head.

In the upper part of thecylinder 1 are the steam-passages 3 3 and 4 4,arranged horizontally in parallel planes one above the other throughouttheir entire length. The passages 3 extend from their ports near themiddle of the valve-seat to the .extreme ends of the cylinder 1, and thepassages 4 extend from their ports near the middle of the valve-seat topassages 5, that pass around the ends of cylinder 1 in nearly Verticalplanes, communicating with the extreme ends of the cylinder 2. Thislocation and arrangement of the passages 3 and 4 in parallel planes andin close proximity to each other, as shown, in-

sure the retention of heat in the exhauststeam of the cylinder 1,thereby increasing the power and economizing in the expense of runningthe engine.

6 designates the exhaust-port located in the valve-seat andcommunicating in the usual way with the atmosphere.

The slide-valve 7 in the steam-chest 10 has in its lower face a recess8, and extending through said valve is a passage 9, the ends of whichterminate in the lower face of the valve and on opposite sides of thesaid recess 8.

The passages 3 3 and 4 4 and the recess 8 and passage 9 are so formedand arranged that when a port of passage 3 on one side of theexhaust-port 6 communicates with one end of the passage 9 the other endof said passage 9 communicates with the port of a passage 4011 theopposite side of said exhanst-port and the other port of passage 4 willcommunicate with the exhaust-port 6 through the recess 8. When a portofone of the passages 3 is open or in communciation with the steamchestthe port of the other is closed to such communication.

The valve 7 may be held on its seat by a spring 13 inclosed in a box 14,the lower edges of which fit in grooves formed in and extending aroundthe upper side of the valve, as shown.

To make clear the-operation of my engine let it be supposed that theport of the lefthand passage 3 is open, so that live steam may enter'thesame, and that the piston is at the end of its stroke at the left-handside, as shown in Fig. 1. Live steam entering said port 3 will force thepiston in the cylinder 1 toward the right, and when it reaches the endof its stroke in this direction the slidevalve (by obvious connectionfor the purpose) will have been thrown so as to establish,

through passage 9, communication between the port of the left-handpassage 3 and the port of the right-hand passage 4, and on the returnstroke the steam in the upper cylinder will pass through the right-handpassage 5 into the lower cylinder, where it will act against the pistonin said cylinder, and thus the two pistons will be forced to the left atthe same time, and when the piston of the lower cylinder 2 moves to theleft the dead steam on its left-hand side will exhaust into theatmosphere through passage 5, passage 4, recess 8, and exhaust-port 6.In other words, while live steam from the boiler is acting on the pistonin cylinder 1 exhaust-steam from said cylinder is acting on thecorresponding side of the piston in cylinder 2, and exhausbsteam in thelatter will escape into the atmosphere.

By the employment of the two cylinders and locating their passages andports and the valve in the particular way shown I not only effect asaving in the cost of the manufacture of the engine and the room to beoccupied by it, but I also effect aconsiderable economy in theconsumption of fuel.

\Vhat I claim, and desire to secure by Letters Patent, is-

In a compound engine, the small cylinder 1 and. the large cylinder 2independent of each other and arranged one above the other, a valve seatin the cylinder 1, the two passages 5 5 extending from the ends ofcylinder 2 in nearly vertical planes upward and around the ends of thecylinder 1, the two passages 3 3 and the two passages 4: 4 arrangedhorizontally in parallel planes one above the other in the upper part ofthe cylinder 1, each of the passages 3 3 extending from aport near themiddle of the valve seat to the extreme ends of the cylinder 1 and eachof the passages 4 4 extending from aport near the middle of the valveseat to the upper ends of the passages 5 5, exhaust port 6, a valve 7having a single passage 9 for connecting the ports 3 3 and 4- r and arecess 8 for connecting the ports of passages 4 4, the ports of thepassages 3 3 and 4: 4:, port 6, recess 8, and passage 9 being arrangedso thatthey are intersected by a plane passing through the axes of bothcylinders, as shown and described.

In testimony whereof I ailix my signature in presence of two witnesses.

CHARLES SCHLARED. Witnesses;

LEWIS L. RANKIN, GEORGE liLFINCKEL.

